Sometimes people refer to how much electrical power a power generator is currently generating, but not in units of power (such as Watts), but as a percentage of its maximum capability.
The first example that comes to mind is from the movie The Hunt for Red October, where a submarine captain who needs to get somewhere in a hurry asks about "going to 105 [percent] on the reactor," i.e. he wants to run the generator at 105% of its... design-maximum something so he can travel faster than the sub's normal maximum speed.
This kind of thing comes up in other fiction, especially Star Trek. But since the context provides so much, the language used (whether dialogue or narration) always seems to omit the specific term for whatever property or setting this is. The example above seems typical.
The only word I've ever heard with any consistency is "level," as in "what's the reactor level?", but it seems pretty clear to me that this is also just conversational shorthand, since it clearly omits some phrase that identifies which level.
It is irrelevant to me whether a change to this performance characteristic is accomplished by turning a single knob vs adjusting very many settings in concert. I'm looking for the term that refers to the observable outcome, not the names of the pieces of machinery that must be adjusted.
What is the correct, precise term that unambiguously for this performance characteristic?
In other words: if a nuclear reactor had a gauge that showed this value, how would it be labeled? (That is my actual use-case: I need to label a readout.)